the Thermal stream in velikobritanii. Measurements of a temperature gradient

you are: the Thermal stream in velikobritanii

Two basic types of devices were applied to temperature measurement.

1. The maximum glass mercury thermometer. It used Benfild, the Anderson, Bullard and Niblett and Mallins and Hinsli. In three last of the mentioned works various methods were applied to detection soskalzyvanija a mercury column. Mallins and Hinsli used groups on three thermometers, or a vertical row of groups at gradient measurement, or individual group at definition of temperature of a face during breaks in drilling. It is possible to take indications of these thermometers with a margin error to 0,2 °F (~0,1 °s), and authors have come to conclusion, that an error caused by indignation of a thermal field in the course of drilling, made no more than 0,8 °F. Bullard and Niblett used three thermometers established on distance of one foot (30,5 sm) from each other in the punched steel tube, and at Benfilda balls of two thermometers have been directed upwards and downwards. Anybody from authors of these works does not inform On accuracy of measurements. The Anderson used the thermometer in the metal cover, the chisel bars screwed on the end, and read its instruments during stops in drilling. According to its estimations, the error was not less than 1 °s.

2. Termistornye probes were used in works. A scheme body here is the electric chain with bridge Uitstona or Siemens where as unknown resistance the thermosensitive element - termistor serves. In a chain of Siemens the probe is connected to the bridge with the help trehzhilnogo a cable. Richardson and Oksburg for calibration of the probes used the platinum thermometer of resistance and have estimated an error of measurements with it in ±0,05 To; accuracy of the received results corresponded to uncertainty of temperature in 0,001 To. In work Tammemagi and Uajldona the relative error used termistornyh the probes, equal ±0,01 °s is resulted. Other authors do not consider a question on accuracy of the measurements.